<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>

    <link href="css/bootstrap.css" rel="stylesheet">
    <script src="jquery/jquery-3.3.1.min.js"></script>
    <script src="js/bootstrap.min.js"></script>

</head>
<body>

<div class="col-lg-12" style="height: 150px;"></div>
<div class="col-lg-4">
    <span class="glyphicon glyphicon-search" aria-hidden="true"></span>
    <span class="glyphicon glyphicon-fire" aria-hidden="true" style="color: red"></span>
    <br>
    <button class="btn btn-danger">删除<span class="glyphicon glyphicon-trash" aria-hidden="true"></span></button>

</div>
<div class="col-lg-4">
    <div class="col-lg-1"></div>
    <div class="col-lg-10">
        <form>
            <div class="col-lg-3"><label style="text-align: right">用户名:</label></div>
            <div class="col-lg-9"><input class="form-control"></div>
            <input type="file">
            <br>
            <input type="radio" class="form-control">
            <br>
            <textarea class="form-control"></textarea>
            <br>
            <input class="form-control" disabled>
            <br>
            <input class="form-control" readonly>
            <br>
            <input type="button" class="btn btn-default" value="default">
            <br>
            <input type="button" class="btn btn-primary" value="primary">
            <br>
            <input type="button" class="btn btn-info" value="info">
            <br>
            <input type="button" class="btn btn-warning" value="warning">
            <br>
            <input type="button" class="btn btn-danger" value="danger">
            <br>
            <input type="button" class="btn btn-success" value="success">
            <br>
        </form>
    </div>
    <div class="col-lg-1"></div>

</div>
<div class="col-lg-4">
    <input type="button" class="btn btn-default btn-xs" value="default">
    <input type="button" class="btn btn-default btn-sm" value="default">
    <input type="button" class="btn btn-default" value="default">
    <input type="button" class="btn btn-default btn-lg" value="default">
    <br>
    <a class="btn">这是一个a标签</a>
    <br>
    <button class="btn btn-danger btn-block ">button</button>
    <button class="btn btn-danger btn-block active">button</button>
    <button class="btn btn-danger btn-block disabled">button</button>
    <br>
    <img class="img-rounded" src="SpringMVC.png" style="width: 100%">
    <img class="img-rounded" src="aaa.jpg" style="width: 100%">
    <img class="img-circle" src="aaa.jpg" style="width: 100%">
    <img class="img-responsive" src="aaa.jpg" style="width: 100%">
    <img class="img-thumbnail" src="aaa.jpg" style="width: 100%">
</div>

</body>
</html>